Object lifecycle in C++ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a constructor for the class.

C++

class MyClass {
public:
    [1]() {
        // Constructor body
    }
};

Drag options to blanks, or click blank then click option'

AMyClass

BMyClass()

Cvoid MyClass

D~MyClass

Attempts:

3 left

💡 Hint

Common Mistakes

Adding a return type like void to the constructor.

Using the destructor name (~MyClass) instead of the constructor.

The constructor has the same name as the class. Here, MyClass is the correct constructor name.

2fill in blank

medium

Complete the code to declare a destructor for the class.

C++

class MyClass {
public:
    [1]() {
        // Destructor body
    }
};

Drag options to blanks, or click blank then click option'

AMyClass

B~MyClass

Cvoid ~MyClass

DDestructor

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting the tilde (~) before the class name.

Adding a return type like void to the destructor.

The destructor has the class name preceded by a tilde (~). Here, ~MyClass is the correct destructor name.

3fill in blank

hard

Fix the error in the constructor definition to properly initialize the member variable.

C++

class MyClass {
    int value;
public:
    MyClass(int v) {
        value [1] v;
    }
};

Drag options to blanks, or click blank then click option'

A:

B==

C=

D->

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' which is a comparison operator, not assignment.

Using ':' inside the constructor body instead of an initializer list.

To assign the parameter v to the member variable value, use the assignment operator =.

4fill in blank

hard

Fill both blanks to use an initializer list to initialize the member variable.

C++

class MyClass {
    int value;
public:
    MyClass(int v) [1] value[2] v) {}
};

Drag options to blanks, or click blank then click option'

A:

B=

C(

D{

Attempts:

3 left

💡 Hint

Common Mistakes

Using '=' instead of ':' to start the initializer list.

Using braces '{}' instead of parentheses '()' for initialization.

The initializer list starts with a colon (:), and member variables are initialized with parentheses ().

5fill in blank

hard

Complete the code to define a copy constructor that copies the member variable.

C++

class MyClass {
    int value;
public:
    MyClass(const MyClass& other) : value( [1] ) {}
};

Drag options to blanks, or click blank then click option'

A:

Bother.value

C(

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting the colon to start the initializer list.

Using the wrong variable name or missing parentheses.

The copy constructor uses an initializer list starting with a colon (:), initializes value with parentheses, and copies from other.value.